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yq/docs/delete/index.html
Mike Farah 0f8b864321 Updated instructions
2019-05-16 14:56:00 +10:00

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From STDIN
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Deleting array elements
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Deleting nodes in-place
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Splat
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Prefix Splat
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Array Splat
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Multiple Documents - delete from single document
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Multiple Documents - delete from all documents
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Keys with dots
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Deleting array elements
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Deleting nodes in-place
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Splat
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Multiple Documents - delete from single document
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Multiple Documents - delete from all documents
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<h1>Delete</h1>
<pre><code>yq d &lt;yaml_file&gt; &lt;path_to_delete&gt;
</code></pre>
<h3 id="to-stdout">To Stdout<a class="headerlink" href="#to-stdout" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">b:
c: 2
apples: green
</code></pre>
<p>then</p>
<pre><code class="bash">yq d sample.yaml b.c
</code></pre>
<p>will output:</p>
<pre><code class="yaml">b:
apples: green
</code></pre>
<h3 id="from-stdin">From STDIN<a class="headerlink" href="#from-stdin" title="Permanent link">&para;</a></h3>
<pre><code class="bash">cat sample.yaml | yq d - b.c
</code></pre>
<h3 id="deleting-array-elements">Deleting array elements<a class="headerlink" href="#deleting-array-elements" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">b:
c:
- 1
- 2
- 3
</code></pre>
<p>then</p>
<pre><code class="bash">yq d sample.yaml 'b.c[1]'
</code></pre>
<p>will output:</p>
<pre><code class="yaml">b:
c:
- 1
- 3
</code></pre>
<h3 id="deleting-nodes-in-place">Deleting nodes in-place<a class="headerlink" href="#deleting-nodes-in-place" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">b:
c: 2
apples: green
</code></pre>
<p>then</p>
<pre><code class="bash">yq d -i sample.yaml b.c
</code></pre>
<p>will update the sample.yaml file so that the 'c' node is deleted</p>
<h3 id="splat">Splat<a class="headerlink" href="#splat" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">---
bob:
item1:
cats: bananas
dogs: woof
item2:
cats: apples
dogs: woof2
thing:
cats: oranges
dogs: woof3
</code></pre>
<p>then</p>
<pre><code class="bash">yq d sample.yaml bob.*.cats
</code></pre>
<p>will output:</p>
<pre><code class="yaml">---
bob:
item1:
dogs: woof
item2:
dogs: woof2
thing:
dogs: woof3
</code></pre>
<h3 id="prefix-splat">Prefix Splat<a class="headerlink" href="#prefix-splat" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">---
bob:
item1:
cats: bananas
dogs: woof
item2:
cats: apples
dogs: woof2
thing:
cats: oranges
dogs: woof3
</code></pre>
<p>then</p>
<pre><code class="bash">yq d sample.yaml bob.item*.cats
</code></pre>
<p>will output:</p>
<pre><code class="yaml">---
bob:
item1:
dogs: woof
item2:
dogs: woof2
thing:
cats: oranges
dogs: woof3
</code></pre>
<h3 id="array-splat">Array Splat<a class="headerlink" href="#array-splat" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">---
bob:
- cats: bananas
dogs: woof
- cats: apples
dogs: woof2
- cats: oranges
dogs: woof3
</code></pre>
<p>then</p>
<pre><code class="bash">yq d sample.yaml bob.[*].cats
</code></pre>
<p>will output:</p>
<pre><code class="yaml">---
bob:
- dogs: woof
- dogs: woof2
- dogs: woof3
</code></pre>
<h3 id="multiple-documents-delete-from-single-document">Multiple Documents - delete from single document<a class="headerlink" href="#multiple-documents-delete-from-single-document" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">something: else
field: leaveMe
---
b:
c: 2
field: deleteMe
</code></pre>
<p>then</p>
<pre><code class="bash">yq w -d1 sample.yaml field
</code></pre>
<p>will output:</p>
<pre><code class="yaml">something: else
field: leaveMe
---
b:
c: 2
</code></pre>
<h3 id="multiple-documents-delete-from-all-documents">Multiple Documents - delete from all documents<a class="headerlink" href="#multiple-documents-delete-from-all-documents" title="Permanent link">&para;</a></h3>
<p>Given a sample.yaml file of:</p>
<pre><code class="yaml">something: else
field: deleteMe
---
b:
c: 2
field: deleteMeToo
</code></pre>
<p>then</p>
<pre><code class="bash">yq w -d'*' sample.yaml field
</code></pre>
<p>will output:</p>
<pre><code class="yaml">something: else
---
b:
c: 2
</code></pre>
<p>Note that '*' is in quotes to avoid being interpreted by your shell.</p>
<h3 id="keys-with-dots">Keys with dots<a class="headerlink" href="#keys-with-dots" title="Permanent link">&para;</a></h3>
<p>When specifying a key that has a dot use key lookup indicator.</p>
<pre><code class="yaml">b:
foo.bar: 7
</code></pre>
<pre><code class="bash">yaml r sample.yaml 'b[foo.bar]'
</code></pre>
<pre><code class="bash">yaml w sample.yaml 'b[foo.bar]' 9
</code></pre>
<p>Any valid yaml key can be specified as part of a key lookup.</p>
<p>Note that the path is in quotes to avoid the square brackets being interpreted by your shell.</p>
<h3 id="keys-and-values-with-leading-dashes">Keys (and values) with leading dashes<a class="headerlink" href="#keys-and-values-with-leading-dashes" title="Permanent link">&para;</a></h3>
<p>If a key or value has leading dashes, yq won't know that you are passing a value as opposed to a flag (and you will get a 'bad flag syntax' error).</p>
<p>To fix that, you will need to tell it to stop processing flags by adding '--' after the last flag like so:</p>
<pre><code class="bash">yq n -t -- --key --value
</code></pre>
<p>Will result in</p>
<p><code>`
--key: --value</code></p>
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